ONE of the following statements is TRUE with respect to human ovary ?
A. Estrogen is secreted by Graffian follicles and progesterone by corpus lutem
B. Estrogen is secreted by cropus luteum and progesterone by Graafian follicles
C. Both estrogen and progesterone are secrted by Graafian follicles
D. Both estrogen and progesterone are secreted by corpus luteum